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> I think the walled garden approach is never really long-term sustainable.

You don't think so, because ... ?

Before AOL there was Compuserve and Delphi. They were all eventually forced to open up their walled gardens.

Facebook is trying to be the middleman in its user's online experience, and we all know what the internet does to middlemen.

If we are to actually _read_ his comment, because of precedents like AOL.